Some 40 years earlier in 1842 the Austrian physicist Christian Doppler had discovered what is now called the Doppler effect. This is the theory that sound waves will change in pitch when there is a ...
2GB/DAY Data for 54 Days Pack 2GB/DAY 54 Days ₹347 2GB/DAY Data for 80 Days Pack 2GB/DAY 80 Days ₹485 3GB/DAY Data for 84 Days Pack 3GB/DAY 84 Days ₹599 ₹997 for 160 Days Pack 2GB/DAY 160 Days ₹997 ...